Means for concealing rivets



(No Model.)

W. S. HULL.

MEANS POR UONCBALING RIVETS, '&G., IN JILS, 350. No. 416,787. Paten-ted Dec. 10,1889.

' UNITED STATES" PATENT OFFICE.

wiLLIAM HULL, or sI-IEFFIELD, ALABAMA.

vlvm-:ANS FOR CONCEAUNGRIVETS, abo., IN JAILS, ato.

SPECIFICATION forming part of Letters Patent No. 416,787, dated December 10, 1889. Application filed June 24,1889. serai No. 315,411. (No model.)

To all whom t may concern,.-

Be it known that I, WILLIAM S. HULL, a citizen of the United States, residing at Shefeld, in the county of lColbert, State of Ala-- the heads of the rivets have been eXposed,

thus enabling a person to punch the same out of place, thereby weakening the structures in which they are used-as, for instance, in a cell, itis only necessary to punch or drill the rivets out of the side wall thereof, when the same will drop out. By my invention I provide a novel method of accomplishing this object, which thoroughly hides the heads of the rivets, dto ,one easily constructed, whereof the parts are capable of being assembled easily and at a minimum cost, andV in a small space of time.

Other objects and advantages of the in vention will appear in the following description, and the novel features thereof will be particularly pointed out in the claims.

Like letters refer to like parts in all theA figures of the drawings.

A represents the wall of a cell, vault, safe, or other structure, which is preferably and usually constructed of sheet-metal plates and lattice or open work in which there are no rivets except at the angles and the joining of sections. In the wall are perforations or openings, which are countersunk and adapted shown at A'X.

to receive rivets A', the heads A2 being adapted to conform with aud'be seated in the said countersunk portions of the wall A, where they are preferably iiush with the surface thereof; or, it'l desired, the part B, hereinafter described, may be countersunk to receive projected heads of the rivets A', as A space is left between the ends of the wall A, and inserted in this opening is a T or other plate B, which is drawn up against said wall A. i

In Fig. l is shown a T-plate; Fig. 2, a crossplate or X; Fig. 3, an L-plate, and Fig. 4 a Y.

C are angle plates having Vperforations formed therein, which are laid lagainst the exterior surface of the wall A, the rivets A passing through the perforations formed therein, and headed, as at A3. In Fig. 4, which represents the lcorner of a structure, the angle is Inore obtuse. i

Passing through the angle-plates C and the T, Y, or other shaped plates B are rivets B', which are headed, as at B2, on both ends.

In Fig. 2, where the X-shaped plate is used, I have secured to the inner arm thereof, by rivets D', headed, as at D2, the partition D.

In Fig. 3 are shown Vtwo angle-plates B, which are inserted in the opening formed in the wall A, and against theangle-plates B are angle-plates C, all said plates beingsecured in place by the riv'ets B', which are headed, as at B2. These plates B serve the same function Vas in other constructions shown, but permit of the insertion of apartition between the same, which partition is held in common with other parts by the exterior located bolt or rivet B'.

It is apparent that 4the terms interior7 and exterior are not used in a limited extent as that part of the structure on which the ends or heads of the rivets or bolts would be exposed, which is not accessible to unauthorized tampering. In case of a cell the interior has no bolts or rivets, while in the case of a safe the exterior surfaces are those in which the bolts are not exposed, and even the exposed bolts and rivets may be protected by IOO having an interioriy extending angie iron Covering the boit and rivet of the wall-plate, substantially as specified,

2.77A joint for a structure of the class speeiiied, consisting of an angle-iron secured to the exterior of a Wall by a boitror rivet passing through the Wall, and an interposed angle-- iron extending over said rivet and secured to the exterior an gie-iron, substantially as specified.

3'. In a structure of the class described, a partition, interior angie-irons arranged adj acent to said partition and to the intersecting walls,l and exterior' angie-irons applied against said interior angle-irons, and fastening devices passing through the Walls and exterior angie, and a fastening device arranged eXteriorly through all of the angie-irons and the partition, substantially as specified.

-L In a corner of a structure of the class described, exterior angie-irons secured to the angle of a Wall, and the seen ring devices thereof, and an interposed angle-iron passing over said fastening devices, and rivets securing all angie-irons together, substantially as specified.

In testimony whereof I affix my signature in I presence of twowitiiesses. Y

Y \VILLIAM S. HULL.

Witnesses: y

R. C. RANDOLPH,

JAMES CADEN. 

